bump tests to >= Julia 1.6

Author: nomadbl

.github/workflows/UnitTest.yml

@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [macos-latest, ubuntu-latest]
-        julia_version: ["1.3", "1", "nightly"]
+        julia_version: ["1.6", "1", "nightly"]
 
     runs-on: ${{ matrix.os }}
     env: